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  1. /*
  2.  * Copyright (C) 2003-2004 Jakub Jermar
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29.  /** @addtogroup mips32
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35.  
  36. #include <arch.h>
  37. #include <arch/boot.h>
  38. #include <arch/cp0.h>
  39. #include <arch/exception.h>
  40. #include <arch/asm.h>
  41. #include <mm/as.h>
  42.  
  43. #include <userspace.h>
  44. #include <arch/console.h>
  45. #include <memstr.h>
  46. #include <proc/thread.h>
  47. #include <proc/uarg.h>
  48. #include <print.h>
  49. #include <syscall/syscall.h>
  50. #include <sysinfo/sysinfo.h>
  51.  
  52. #include <arch/interrupt.h>
  53. #include <arch/drivers/arc.h>
  54. #include <console/chardev.h>
  55. #include <arch/debugger.h>
  56. #include <genarch/fb/fb.h>
  57. #include <debug.h>
  58.  
  59. #include <arch/asm/regname.h>
  60.  
  61. /* Size of the code jumping to the exception handler code
  62.  * - J+NOP
  63.  */
  64. #define EXCEPTION_JUMP_SIZE    8
  65.  
  66. #define TLB_EXC ((char *) 0x80000000)
  67. #define NORM_EXC ((char *) 0x80000180)
  68. #define CACHE_EXC ((char *) 0x80000100)
  69.  
  70. bootinfo_t bootinfo;
  71.  
  72. void arch_pre_main(void)
  73. {
  74.     /* Setup usermode */
  75.     init.cnt = bootinfo.cnt;
  76.    
  77.     __u32 i;
  78.    
  79.     for (i = 0; i < bootinfo.cnt; i++) {
  80.         init.tasks[i].addr = bootinfo.tasks[i].addr;
  81.         init.tasks[i].size = bootinfo.tasks[i].size;
  82.     }
  83. }
  84.  
  85. void arch_pre_mm_init(void)
  86. {
  87.     /* It is not assumed by default */
  88.     interrupts_disable();
  89.    
  90.     /* Initialize dispatch table */
  91.     exception_init();
  92.     arc_init();
  93.  
  94.     /* Copy the exception vectors to the right places */
  95.     memcpy(TLB_EXC, (char *)tlb_refill_entry, EXCEPTION_JUMP_SIZE);
  96.     memcpy(NORM_EXC, (char *)exception_entry, EXCEPTION_JUMP_SIZE);
  97.     memcpy(CACHE_EXC, (char *)cache_error_entry, EXCEPTION_JUMP_SIZE);
  98.  
  99.     interrupt_init();
  100.     /*
  101.      * Switch to BEV normal level so that exception vectors point to the kernel.
  102.      * Clear the error level.
  103.      */
  104.     cp0_status_write(cp0_status_read() & ~(cp0_status_bev_bootstrap_bit|cp0_status_erl_error_bit));
  105.  
  106.     /*
  107.      * Mask all interrupts
  108.      */
  109.     cp0_mask_all_int();
  110.  
  111.     /*
  112.      * Unmask hardware clock interrupt.
  113.      */
  114.     cp0_unmask_int(TIMER_IRQ);
  115.  
  116.     console_init();
  117.     debugger_init();
  118. }
  119.  
  120. void arch_post_mm_init(void)
  121. {
  122. #ifdef CONFIG_FB
  123.         fb_init(0x12000000, 640, 480, 24, 1920); // gxemul framebuffer
  124. #endif
  125.         sysinfo_set_item_val("machine." STRING(MACHINE),NULL,1);
  126. }
  127.  
  128. void arch_pre_smp_init(void)
  129. {
  130. }
  131.  
  132. void arch_post_smp_init(void)
  133. {
  134. }
  135.  
  136. /* Stack pointer saved when entering user mode */
  137. /* TODO: How do we do it on SMP system???? */
  138.  
  139. /* Why the linker moves the variable 64K away in assembler
  140.  * when not in .text section ????????
  141.  */
  142. __address supervisor_sp __attribute__ ((section (".text")));
  143.  
  144. void userspace(uspace_arg_t *kernel_uarg)
  145. {
  146.     /* EXL=1, UM=1, IE=1 */
  147.     cp0_status_write(cp0_status_read() | (cp0_status_exl_exception_bit |
  148.                           cp0_status_um_bit |
  149.                           cp0_status_ie_enabled_bit));
  150.     cp0_epc_write((__address) kernel_uarg->uspace_entry);
  151.     userspace_asm(((__address) kernel_uarg->uspace_stack+PAGE_SIZE),
  152.               (__address) kernel_uarg->uspace_uarg,
  153.               (__address) kernel_uarg->uspace_entry);
  154.     while (1)
  155.         ;
  156. }
  157.  
  158. /** Perform mips32 specific tasks needed before the new task is run. */
  159. void before_task_runs_arch(void)
  160. {
  161. }
  162.  
  163. /** Perform mips32 specific tasks needed before the new thread is scheduled. */
  164. void before_thread_runs_arch(void)
  165. {
  166.     supervisor_sp = (__address) &THREAD->kstack[THREAD_STACK_SIZE-SP_DELTA];
  167. }
  168.  
  169. void after_thread_ran_arch(void)
  170. {
  171. }
  172.  
  173. /** Set thread-local-storage pointer
  174.  *
  175.  * We have it currently in K1, it is
  176.  * possible to have it separately in the future.
  177.  */
  178. __native sys_tls_set(__native addr)
  179. {
  180.     return 0;
  181. }
  182.  
  183.  
  184.  /** @}
  185.  */
  186.  
  187.